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Fluid: 4% Kraft Stock

Flow Rates: 
1500-3500 GPM [409-955 m³/hr]

Inlet Temperature:
90°F [32°C]

Discharge Temperature:
125°F [52°C]

Fluid Supply Pressure:
20 PSIG [1.4 barg]

Steam Supply Pressure:
150 PSIG [10.3 barg]

Steam Superheat:
Yes, to 525°F [274°C]


Pulp & Paper: Bleaching

A container board manufacturer and paper mill needed a heater to precisely control the temperature of the Kraft stock prior to bleaching to maximize chemical efficiency and minimize bleaching costs. Hydro- Thermal® was contacted to design a Hydroheater® to replace a current direct contact steam heating system, an adaptation of a static mixer. Stress cracking in the mixer was caused due to inadequate condensing capabilities, rough operation and vibration. Steam hammering on startup was severe enough to compromise the mixer and associated piping supports.

Learn More about Direct Steam Injection


Hydro-Thermal engineers determined that in order to meet the stock flow requirements, a larger Hydroheater would be requiredthan had been previously designed. With winter fast approaching, and with it the complications caused by lower temperatures, Hydro-Thermal was faced with designing and manufacturing a custom Hydroheater in only four months. The decision was made to fabricate the new Hydroheater rather than use stainless castings. Delivery and installation were accomplished three weeks ahead of schedule. The Kraft stock temperature is precisely controlled within 1°F [.5°C]. All hammering and vibration problems have been eliminated completely, and after six months of operation, no downtime has

Explore Our Industrial Steam Heaters


• Precise temperature control
• Maximize chemical efficiency
• Eliminate lost production
• Stabilize operation


• Precise temperature control
• Eliminated hammering and vibration
• Stabilized operation



Are you curious about our patented direct steam injection technology? Click here to learn more.

Are you wondering what applications are ideal for direct steam injection? See the Where It Works section for the a list of industries.

Do you want to learn more about our products? Click here for more information.

Related Industries



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Hydro-Thermal is the global leader in the development and manufacturing of Hydroheaters. Through our vast global channel partners, we support hydro heating in six continents and all industrialized areas. We create heating systems for a variety of industries including: pulp, paper, chemical, ethanol, food & beverage, metal, & more!

Hydro-Thermal Corporation 

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